package bitetianan_xing.utils;

import com.mysql.cj.jdbc.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DBUtil {
    //数据源
    private  static DataSource dataSource = null;
    //数据库连接串
    private  static  final  String URL ="jdbc:mysql://127.0.0.1:3306/javatest?characterEncoding=utf8" +
            "&allowPublicKeyRetrieval=true&useSSL=false";
    //用户名
    private  static  final String USER = "root";
    //密码
    private  static  final  String PASSWORD ="Wm127369#";
    //当类加载到JVM的时候，执行数据源的初始化
    static {
        MysqlDataSource mysqlDataSource = new MysqlDataSource();
        mysqlDataSource.setURL(URL);
        mysqlDataSource.setUser(USER);
        mysqlDataSource.setPassword(PASSWORD);
        dataSource = mysqlDataSource;
    }
    /**
     * 构造方法私有化，防止new这个对象
     */
    private  DBUtil(){}
    /**
     * 获取数据库连接
     *
     * @return
     * @throw SQLException
     */
    public static Connection getConnection()throws SQLException{
        return  dataSource.getConnection();
    }
    public static void close(ResultSet resultSet, Statement statement,Connection connection){
        if (resultSet !=null){
            try {
                resultSet.close();
            }catch (SQLException e){
                e.printStackTrace();
            }
        }
        if (statement !=null){
            try {
                statement.close();
            }catch (SQLException e){
                e.printStackTrace();
            }
        }
        if ( connection !=null){
            try{
                connection.close();
            }catch (SQLException e){
                e.printStackTrace();
            }
        }
    }
}
